Subsequent Events	6 Months Ended
Mar. 31, 2022
Subsequent Events [Abstract]
Subsequent Events	Subsequent EventsOn April 1, 2022, the Company acquired the remaining 32% interest in Frontier from the Minority Owners for an aggregate purchase price of $10,396, which is included in Accrued expenses and other liabilities on the Consolidated Balance Sheets at March 31, 2022.Also on April 1, 2022, the Company acquired the remaining 50% partnership interest in TWO from Nalco for an aggregate purchase price of $1,099.

The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-URI http://asc.fasb.org/topic&trid=2122774

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6842918&loc=SL6314017-165662

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